Interface should be named clientInterface
with at least 6 methods
Implementation should be named clientImpl and should implement the
clientInterface
Exception class should be named clientException and should be utilized by the
clientImpl class

Create a test application that instantiates a number of the clientImpl
objects, invoke a clientException.

I already created all class files, but my clientimpl and clientException class is not working!!!
Can anybody help. I have attached file.